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【原创】读书笔记--铁对缺磷情况下拟南芥初生根伸长生长的影响
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The Effect of Iron on the Primary Root Elongation of Arabidopsis during Phosphate Deficiency Ward JT etal., 2008. Plant Physiology. 147:1181-1191 Root architecture differences have been linked to the survival of plants on phosphate (P)-deficient soils, as well as to the improved yields of P-efficient crop cultivars. To understand how these differences arise, we have studied the root architectures of P-deficient Arabidopsis plants. A striking aspect of the root architecture of these plants is that their primary root elongation is inhibited when grown on P-deficient medium. Here, we present evidence sugggesting that this inhibition is a result of iron (Fe) toxicity.When the Fe concentration in P-deficient medium is reduced, we observed elongation of the primary root without an increase in P availability or a corresponding changes in the expression of P-deficiency-regulated genes.Recovery of the primary root elongation is associated with larger plants weights, improved ability to take up P from the medium, and increased tissue P content. This suggests that manipulating Fe availability to a plant could be a valuable strategy for improving a plant's ability to tolerate P deficiency. 在邮箱文献alert中看到这个题目，连到杂志一看，看得懂，而且结果似乎也有使用的参考价值。所以在此备忘。 铁对缺磷情况下拟南芥初生根伸长生长的影响 植物根系结构的差别影响着其在缺磷土壤下的存活，同时也关系着磷高效植物（P-efficient plants?）的产量。为了弄清这些根系结构的差别，对磷缺失（P-dificient）拟南芥的根系结构进行了研究。磷缺失拟南芥根系结构的一个主要特征表现为初生根伸长生长在磷缺乏基质上受到抑制。本研究证明这种抑制是由铁毒效应引起的。当磷缺乏基质中的铁浓度降低时，初生根伸长增加，但磷含量并未增加，磷调控的基因表达也未见变化。初生根伸长生长的恢复导致植物重量增大，从基质中吸收磷的能力提高，组织中磷含量增加。这些结果表明调控植物供铁量是一条提高植物磷缺乏抗性的重要途径。 |
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